Ball-mill.



F. EMARCY.

BALL MILL.

APPLICATION `FILED MMI. 3. I9I5.

Patented Sept. 14, 1915.

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' ATTORNEY.

F. E. IWARCY.

BALL MILL.

A PPucATloM FILED mm1. 3. 1915.

1,153,239. Pamndspt. 14, 1915.

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F. E. MARCY.

Y BALL rmLL. V APPLICATION FILED MAR. 3| I9I'5.

Patented sept. 14, 1915.

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Specification of Letters Patent.

Applicationvled March 3, 1915. Serial No. 11,71%. l

To all whom it may concern g Be it known that I, FRANK E.. MARCY, a citizen of the United States, residing at Salt Lake City, in the county of Salt Lake and State of Utah, have invented certain new and useful Improvements in Ball-Mills, of...

which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

My invention has relation to improvements in ball-mills; and it consists in the novel features of construction more fully set forth in the specification and pointed out in the claims.

The present invention is more particularly directed to the diaphragm or transverse screen or grate of ball-mills on the order of that described in my pending application, Serial Number 842,722, filedl June 3, 1914, being in effect an improvement on the construction shown in said pending application.

The objects contemplated by the present improvement are the same as those enumerated for the invention of the pending application aforesaid, the improvement herein possessing however decided advantages over the original construction, by reason of its simplicity, superiority in the construction of details, durability, reduction in the-number of parts composing the mill as a whole, and

other structural features the virtues of which will be more fully apparent from the following detailed description of the invention in connection with the accompanying drawings in which- Figure 1 is an end elevation of a mill employing my grate, viewed from the feed end, parts being broken away; Fig. 2 is a side elevation with parts in section; Fig. 3 is an enlarged cross-sectional detail on the line 3 3 of Fig. 2 showing a portion only of the screen-grate, one of the sections of the grate being removed to expose the supporting lifter therefor; Fig. 4 is a vsectional detail on the line 4 4 of Fig. 3, taken through one of the supporting lifters; Fig. 5 is a sec tional detail on the line 5 5 of Fig. 3 taken through the grate between the supporting lifters; Fig. 6 is a sectional detail on the line 6 6 of Fig. 3; Fig. 7 is a face view of a large grate section; Fig. 8 is a view of the same section taken at right angles to Fig. 7 Fig. 9 is a face view of one of the small grate sections; Fig. 10 is a view of the same section taken at right angles to Fig. 9; Fig. 11 is an end view of the inner shell or.l eripheral-wall lining; Fig. 12 is an elevation of the wall lining, partly in section; Fig. 13 is a vface elevation of the feed-end liner; Fig. 14 is an-edge view thereof, partlyin section; Fig. 15 is an enlarged sectional detail showing the manner of locking the liners to the outer 4shell of the mill; and Fig. 16 is a sectional detail through the shell wall only,

on the line 16A-16 of Fig. 15. V

Referring to the drawings, 1 4represents a cylindrical (preferably cast iron) container,

i QFFICE.

. Patented sept. ii, wie.

drum, or tumbling barrel (or equivalent f tubular member), the same being provided with a one-piece liner or lining 2 of steel, hard gray iron, silex or equivalent material, said lining member being a solid ring/ like a roll shell, but corrugated longitudinally on the inside as shown at a (Fig. 11) the corrugations keeping the -mill balls from sliding and causing the balls and material to be carried up the usual height in the rotation of the mill. The feed-end head 3 of the mill is likewise provided with a one-piece liner`4, said feed-end liner being inthe form lof a steel or equivalent disk provided with a central opening O, and hand-holes H, H, the outer face of the liner being substantially plane toengage the` inner face of the head 3, the opposite or inner facel of the liner sloping or inclining toward the central opening as shown to best advantage in Fig. 14. The

said liner-4 is formed ywith an inner circular in position to engage the end of the wall' l liner 2 (Fig. 15). The liner 2 is provided at each end at points diametrically opposite one another with marginal notches or recesses la. opening through the periphery and end of the liner wall (Fig. 12), said recesses receiving the lugs 5, 5, cast with the shell or cylindrical portion of the .mill, the lugs 5 being located at the corner formed by the shell and the feed-end head 3. The lu/gs 5 are likewise received by the recesses h', h', formed along the outer edge of the liner disk 4, the said lugs 5, 5', preventing any rotary displacement of the liner members once they are installed in the mill. In practice, the mill is stood'on end and opened in the middle (the shell being in two sections as shown) whereupon th feed-end liner or of the mi 40 series of grate bars t.

disk 4 is deposited on the head 3, the recesses It', It', thereof being passed ove:` the lugs`5, 5. yThen the hell liner 2 is deposited in the half l l carr ing the liner 4, the recesses h, h, of the en inserted being assed over l the lugs 5,5. Then the second alf of the mill is passed over the remaining half of the shell liner 2, the lugs 5 being received by the opposite terminal recesses h., h, of said liner,

o and when the two halves of the shell are bolted together, the parts thus assembled are united so as to-rotate as a unit, there being no possibility of displacement of the liner members T e liner members bein thus secured without the use of bolts (usua ypassd through the walls lof the mill) there is an entire absence of leaks.

The intake for the feed or pulp is through the hollow trunnion 6 formed with the head 3, the feed entering the crushing compartment C of the mill, the crushed material or finished product discharging through the discharge trunnion 7 formed with the opposite head 3 of the mill.

Forming one of the terminal walls of the crushing compartment, to wit, the wall adjacent the trunnion 7, and spaced from the head 3 by a series of radial vanes, blades or lifters 8, is an Iannular or disk-like screen 'or grate (or equivalent diaphragm) comprising a series of radial primary segments or sectors 9 (of manganese steel), each sec- -Mtor being in turn made up of a series of transverse sections or grate bars separable 3,5 along planes or surfaces disposed substanthe said lugs serving to space the several bars apart and thus form the necessary grate openings or spaces between the bars. The terminals of the several grate sections (m, n, t, t,) rest upon or bear against the free edges of the lifters 8, the ends of the sections having beveled or inclined faces w ysloping toward the edge of the lifter, thereby forming collectively a V-shaped groove over each lifter when the several sectors are assembled and are resting on the lifters.

This groove receives a suitable clamping bar or wedge 10 which bears against the sloping faces 'w of adjacent sectors, the bar being Hush with the inner surfaces of the grate, 'and secured in position by bolts 11 traversing the blade or lifter 8 (Fig. 6), a suitable tightening nut 12 being passed over the projecting end of the bolt on the outside of the millhead 3. The heads 11 of the bolts are conical, fitting into the conical bottoms of the openings o formed for their reception in the clamping bar, whereby, upon driving home the nuts- 12, the bars 10 are drawn into firm engagement with the beveled sides of the grate sectors (Fig. 6). At points intermediate the lifters 8, the several grate sectors are additionally supported by radial ribs 13 as shown.

Formed along the inner wall of the shell 1, and in position to afford a bearing or support for the outer sections m of the several grate sectors is an annular ledge 14 whose supporting face is disposed in the plane of the supporting edges of the members 8 and 13 (Figs. 4, 5). Adjacent said -ledge 14 and opposite the grate sectors there are formed on the shell wall a series of bosses 15 provided with sockets e, the bosses receiving suitable radially disposed screvvlbolts 16 adapted to bear with their inner ends against the adjacent convexed edges of the outer grate sections fm., there being two such bolts -engaging each section. The sockets e receive the nuts 17, the bolts carrying locknuts 18 on the outside. The opening d of the boss 15 which receives the bolt 16 .is not threaded (Fig. 3), leaving the nuts 17, 18, to take up the strain imposed on the bolt, outward displacement of a bolt being arrested by the nut 17 resting against the base of the socket ,e. The several bolts serve to force the grate sectors radially inward, and hold the same against outward radial movement or displacement, should the clamping bars 10 for any reason be insuicient to properly hold the several sectors. By radial displacement is meant a displacement transverse to the axis of rotation of the mill, the screen-grate being disposed across said axis. The walls of the central opening of the grate 9 are btfeled and surround and engage a central imperforate (except at the center) disk 19, the same as in my pending application aforesaid, the disk 19 in the present cas engaging the inner portions of the inembers 8. Gbviously, to accommodate the bevel edge of the disk (19) the inner ends of the clamping bars 10 should be beveled (Fi 4). These details however may be changed, as well as many others, Without departing from the nature or spirit of my invention.

Very little need be said as to the operation of the mill. The material is fed to the mill through the hollow trunnion 6 into the crushing compartment C, where it is ground, during the rotation of the mill about its axis, the line particles passing through the screengrate composed of the sectors 9, and entering the radial compartments between the lifters 8, the grate sectors and the disk 19 being spaced from the head 3 a distance equal to the widths of the lifters against the edges of which they bear. The crushed material is conducted out through the discharge trunnion 7 the coarse particles which cannot 1,153,2so n f pass through the grate remaining in the crushing compartment until s'uciently reduced in size.

Features shown but not alluded to are well known in the'art and require no description in the present connection. v

Having described my invention what I claim is 1. In combination with a drum rotatable about a fixed axis and provided with terminal heads having openings respectively for the feed and discharge of the material, a series of radial blades or lifters-di'sposed on the inner surface of one of the heads, grate sectors'having contiguous edges resting on the inner edges of the blades, and means en- ,gaging the edges of'the sectors for securing the sectors to the blades. i

2. In combination with a drum rotatable about a fixed axis and provided with terminal heads having openingsrespectively for the feed and discharge of the material, a series of radial blades or lifters disposed on the inner surface of one of the heads, grate sectors having contiguous edges resting on the inner edges of the blades, means engaging the edges of the sectors for securing the sectors to the blades, and means on the head aforesaid affording a support for the sectors at points between the blades. v 3. In combination with a drum rotatable about a xed axis and provided 'with terminal heads having openings respectively for the feed and discharge of the material, a series of radial blades or lifters disposed on the inner surface of one of the heads, grate sectors having contiguous edges engaging the inner edges of the blades, a clamping bar engaging thecontiguous edges of each pair of sectors, and means traversing the blade for securing the bar to the blade supporting said grate sectors.

4. In combination with a drum rotatable about a fixed axis and provided with terminal heads having openings respectively for the feed and discharge of the material, a

series of radial blades. or lifters disposed on the inner surface of one of the heads, grate sectors having contiguous beveled edges, resting on the edges of the blades, a clamping bar resting between the beveled edges of contiguous sectors, bolts passed through the blades and bars for securing the latter in place', the outer ends of the bolts projecting through the head aforesaid, and tightening nuts carried by the projecting ends of the bolts on the outside of the head.

5. In a ymill of the character described having a peripheral shell and a feed-end head, a one-piece feed-end liner for the head provided with marginal recesses, and A.

corner lugs on the shell wall adjacent the head engaging said recesses for holding the liner against rotary displacement.

6. In a mill of the character described,

and having a peripheral shell and a feed-end head, a one-piece wall liner provided with outer terminal marginal recesses, a onepiece feed-end liner fory the head provided with outer mar inalrecesses, and corner lugs on the mil simultaneously engaging the recesses of the liners tov hold the latter against rotary displacement.

7. In a mill of the character described, a one-piece tubular wall liner, a onepiece feed-end liner provided with an olset or shoulderentering one end of the wall-liner, the portion surrounding or outside the offset engaging the end of the wall liner, and means on the corners of the mill for maintaining the liners against rotary displacement.v

8. Ina mill of the character described,'a feed-end liner comprising a disk provided ,with outer' recesses, an annular shoulder removed aA suitable distance from the outer edgeof the disk, and having a central feed opening.

9. In a ball-mill of the character described, a screen-plate comprising a series of sectors disposed across the axis of rotation of the mill and adjustable screw-bolts disposed on the peripheral wall of the mill andl engaging the outer terminals of the sectors for holding the latter against radial displacement.

10. In a ball-mill of the character described, a screen-grate disposed across the axis of rotation of the mill, hollow bosses disposed circularly about the peripheral wall of the mill and provided with inner sockets, radially disposed screw-bolts passed through the bosses and provided with nuts resting in the sockets aforesaid, nuts on the outer portions of the bolts bearing against the outer ends of the bosses, the inner ends of the bolts engaging the outer edge of the grate for holding the latter against displacement.

11. In a 'ball-mill ofthe character described, a shell, a head at the discharge end of the mill, a, series of radial lifters on the head, and an annular ledge on the inner wall of the shell having a supporting surface disposed in the plane of the free edges of the lifters.

12. In a ball mill of the character described, a screen-grate comprising a series of sectors disposed across the axis of rotation of the mill and each composed of transverse grate bars suitably spaced apart, and screwbolts disposed on the peripheral walls of the mill and engaging the outer terminals of' peripheral walls of the mill and engaging engaging said recesses for holding the liner the outer edges of the several sectors, and against rotary displacement. 10 means for eiecting `radial adjustment of In testimony whereof I affix my signature, said members from points outside the mill. in presence of two witnesses.

5 14. -In a mill of the character described FRANK E. MARCY.

and having a peripheral shell, a one-piece Witnesses: Wall liner provided with outer terminal ma- H. I. GooDsPEED,

ginal recesses, and corner lugs on the mill I. F. S. OLSON. 

